Keithley 2651A Reference Manual page 60

Section 2: General operation
Hazardous voltages may be present on the output and guard terminals. To prevent electrical
shock that could cause injury or death, NEVER make or break connections to the Model 2651A
while the output is on. Power off the equipment from the front panel or disconnect the main
power cord from the rear of the Model 2651A before handling cables connected to the outputs.
Putting the equipment into standby does not guarantee the outputs are not powered if a
hardware or software fault occurs.
Contact check commands
The following table summarizes basic contact check commands. See
5-1) for more information on using these commands.
Basic contact check commands
Command
flag = smua.contact.check()
rhi, rlo = smua.contact.r()
smua.contact.speed = speed_opt
smua.contact.threshold = rvalue
2-38
Model 2651A High Power System SourceMeter® Instrument Reference Manual
WARNING
Figure 10: Contact check measurement connections
SENSE/GUARD
S
LO G G G G
R R R
S S S
R R R
C C
HI
S LO
LO
Remote Commands
Description
Determine if contact resistance is lower than
threshold.
Measure the contact resistance.
Set speed_opt to one of the following:
0 or smua.CONTACT_FAST
1 or smua.CONTACT_MEDIUM
2 or smua.CONTACT_SLOW
Resistance threshold for the contact check
function.
OUTPUT
LO HI
S
HI
40V, 50A MAX.
Cable/Relay
Resistance
Contact
C
Resistance
S HI
DUT
2651A-901-01 Rev. A / March 2011
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